At first, I wanted to do a full-fledged game with powerups and multi-directional weapons, but the time on my hands was getting short and I wanted to make sure I could enter the contest. So! Here is my game, formatted into footer format (previous, 550*400 versions were less complete).
As you reach the first and second thirds of the game(thus your kill count), the difficulty increases.
The plasma missile-orb type-a-things are super-technologically-enhanced-seekers-3000. Yep, they tend to head for the mouse location in real-time!
The flamer weapon is just an overkill gadget, make sure you try it out by pressing <BACKSPACE> to switch weapon!
Click HERE to try the game.